Blast furnace



Aug. 29, 1933. 4 A J, EBNER 1,924,842

BLAST FURNACE Aug. 29, 1933. A. J. EBNER 1,924,842

BLAST FURNACE Filed 00?.. 50, 19,51 3 Sheets-Sheet 2 Patented Aug. 29, 1933 UNITED STATES BLAST FURNACE Alfred J. Ebner, Chicago, Ill., assignor to Freyn Engineering Company, Chicago, Ill., acorporation of Maine Application October 30, 1931. Serial No. 571,955 2 Claims. `(Cl. 266431) The invention relates to blast furnace construen tion and has reference particularly to improved means for eliminating dust and other finely divided matter from blast furnace gas whichv is withdrawn from the upper or charging portion of the furnace.

An object of the invention is to'provide a dust eliminator for blast furnaces.

A more specic object is to provide means of such a nature and so located with respect to the level of the stock in the furnace as to direct the furnace gases to their outlets and in so doing to prevent (3o-mingling of the gases with the line particles of dust and foreign matter caused by agitation in the charging of the stock.

A further object is to provide means extending below the level of the stock in the furnace for directing the furnace gases toward their outlets, the installation resulting in the tapping of the g gases at their source and before they have become contaminated with excessive dust and other solid matter.

With these and various other objects in View, the invention may consist of certain novel features of construction and operation as will be more fully described and particularly pointed out in the specification, drawings and claims appended hereto.

In the drawings which illustrate an embodiment of the device and wherein like reference characters are used to designate like parts- Figure 1 is a vertical sectional view showing the charging portion of a blast furnace equipped with one form of dust eliminator according to the present invention;

Figure 2 is a sectional View taken along line 2-2 of Figure l;

Figure 3 is a vertical sectional view showing the charging portion of a blast furnace as equipped with still another modication of dust eliminator;

Figure 4 is a sectional view taken along line 4 4 of Figure 3;

Figure 5 is a vertical sectional View showing the charging portion of a blast furnace as equipped with still another modification of dust eliminator; and

Figure 6 is a sectional view taken along line 5 6 of Figure 5,

'09 Referring first of all to Figures 1 and 2 wherein the invention is shown as embodied in a blast furnace formed of circular walls 10 having provided in the upper or charging portion of the furnace a plurality of wear plates 11 and staggered layers of bricks 12 to form a restricted opening for receiving the hopper 13. The wear plates serve to protect the walls of the furnace against the wearing action due to the charging of the stock which consists Vof ores, coke and limestone, the stock being admitted tothe furnace through an opening formed in the lower porti-on of hopper 13 and normally closed by the charging bell 14 actuated to the Vertical by reciprocating member 15.

The stock in the charging portion of the furnace is normally maintained at a level indicated by the dotted lines at 16 and through the firing of the furnace in the well known manner the fuel is ignited, causing a reduction of the -ore and the flux, which operation generates gases known as blast furnace gases, and in order to conserve the same so that their heating value may be subsequently utilized, they are conducted from the furnace through conduits 18. In accordance with the present invention the conduits enter the furl nace at a point substantially below the wear plates 11 and below the stock line 16, the outlets 20 for the gas being angular with respect to the walls of -the furnace and terminating a slight distance within the furnace.

With the outlets for the blast furnace gas located at a point below the stock level it will be seen that the gases are tapped at their source and are conducted from the furnace before they have opportunity to become laden with excessive dust and other solid particles. The charging operation admits to the upper portion of the furnace the ores and other necessary materials and the agitation caused thereby maintains the air above the stock level saturated with dust andr other undesirable particles of solid matter. This dust is thus prevented from passing along with the air which is drawn from the charging portion of the furnace and discharged through the conduits 18, since the stock above the outlets 20 forms a filter, removing substantially all of the solid matter so that the gases finally withdrawn are substantially free from solid matter and in condition to be utilized without being subjected to furf ther cleansing operations.

Referring particularly to Figures 3 and 4 it will be seen that the blast furnace is here provided with a member 26 simulating a Greek cross and uniting Vwith the'respective ends 20 of the conduits 18. The member is positioned centrallyand supported in the upper portion of the furnace immediately below the charging bell 14 and in order to prevent accumulation of the stock admitted to the opening in the hopper 13 on the upper surface of the member the same is formed@ frs-l with a taper indicated at 27. Since the conduits are joined by the member the same functions as an outlet for the furnace gases, and in order to carry out the feature of the present invention the mouth of the member is directed downwardly and terminates at a point below the normal level of the stock. Since the member terminates below the stock level it functions in the same manner as the modifications described.

In Figures 5 and 6 another constructional arrangement of dust eliminator is disclosed including a dome-shaped member 30 located in inverted position, that is, with its mouth directed downwardly centrally of the charging portion of the furnace. The outlets of the conduits 18 are extended inwardly so as to connect with the dome member. Since the latter provides a pointed upper end and as the conduits are all of rounded contour little opportunity is presented for the accumulation on the upper surfaces of these members of the stock admitted to the furnace. The mouth of the member 30 terminates below the level of the stock and vthus the flue dust is filtered by the flow of the cases through the stock and prevented from passing along with the gases to the conduits.

It is to be understood that I do not wish to be limited by the exact embodiment of the device shown, which is merely by way of illustration and not limitation, as various and other forms of the device will of course be apparent to those skilled in the art without departing from the spirit of the invention or the scope of the claims.

I claim:

l. In a blast furnace, in combination with a hopper and charging bell, of conduits communicating with the interior of the furnace, gas collecting means positioned within the furnace and in communicating connection with the conduits, said means terminating and having an opening below the stock line, so that the furnace gases are collected through said openings and are discharged by the conduits.

2. In a blast furnace, in combination with a hopper and charging bell, of conduits communicating with the charging portion of the furnace, a dome shaped member connecting the conduits and being located directly below the charging bell, said member having an opening in its base directly downwardly and extending below the 

